What is the ruling on marrying a person who works in a factory that produces mu‘assal (flavored tobacco) used in shisha, and is his money 100% lawful?

A woman should not agree to a suitor unless he is religious and of good character, as the Prophet, peace and blessings be upon him, said: "If there comes to you one whose religiosity and character you approve, then marry him. If you do not do so, there will be tribulation on earth and great corruption." It was therefore incumbent upon your cousin not to accept someone whose earnings were unlawful. Our advice to her is to suggest to her husband that he leave this work and seek lawful employment. If he responds, then all is well and good. Otherwise, she is permitted to seek a divorce to preserve the lawfulness of her sustenance. Divorce is better than being married to a man who earns from unlawful means. Moreover, forsaking desires for the sake of Allah leads to prompt compensation in this world, for the Prophet, peace and blessings be upon him, said: "Indeed, you will not abandon anything for the sake of Allah, the Blessed, the Most High, except that Allah will give you something better than it."